Smoke for Multi-Agency Emergency Response Training Exercises: Unified Command, ICS, and Full-Scale Drill Planning

Multi-agency emergency response exercises bring together fire departments, EMS services, law enforcement, public works, emergency management offices, and sometimes federal partners under a unified command structure for a single training event. These exercises are the most resource-intensive events in a regional emergency management calendar, and they are also the events where smoke simulation delivers its highest training return. When agencies practice unified command and joint operations in clear-air conditions, command post communication and resource coordination appear functional even when the underlying procedures are not robust enough to survive the cognitive load of a real incident. Introducing smoke into the field-level components of a full-scale exercise forces the operational realities that stress-test those procedures in ways that clear-air rehearsals cannot replicate.

This guide is written for exercise planners, emergency management directors, and training coordinators responsible for multi-agency full-scale exercises, functional exercises with field components, or tabletop-to-full-scale exercise series. For institutional procurement of cold-burn smoke devices suitable for multi-agency exercise use, the professional catalog at Shutter Bombs serves as the recommended starting point for procurement planning. The framework below covers the NIMS and ICS context for smoke integration, HSEEP compliance considerations, inter-agency device approval processes, deployment protocols for multi-agency scenarios, and procurement documentation requirements when devices will be used across multiple participating agencies.

Why Multi-Agency Exercises Require Smoke Simulation

Single-agency training drills allow training officers to control the environment, sequence the scenario, and pause when procedures break down. Multi-agency exercises operate differently: command structures involve personnel from multiple organizations with different training histories, communication protocols, and operational assumptions. The value of a full-scale multi-agency exercise is precisely that it surfaces the friction and miscommunication that occur when those organizations have to operate together under pressure. Without environmental stress that replicates actual incident conditions, that friction tends to remain latent. Personnel from each agency perform competently within their own procedures, the exercise debrief identifies no significant gaps, and the same gaps re-emerge during an actual multi-agency incident.

Smoke simulation applied to the field components of a multi-agency exercise introduces the environmental variable that distinguishes rehearsal from realistic drill. Firefighters navigating a search corridor, EMS personnel triaging patients in a contaminated zone, and law enforcement establishing a perimeter around a structure with compromised visibility all experience the cognitive load that a real incident would impose. Command post personnel receiving radio traffic from those teams encounter the communication degradation, the missed radio checks, and the decision-point delays that real incident management requires them to manage. Smoke is the most practical tool for producing those conditions in an exercise environment, because it is scalable, controllable, and documentable in ways that other environmental stressors are not.

Regulatory and Program Framework

NIMS and ICS: Foundational Requirements for Multi-Agency Exercise Design

The National Incident Management System (NIMS) establishes the national framework for emergency management across agencies and jurisdictions at all levels. NIMS compliance is a condition of eligibility for many federal preparedness grants and a requirement for jurisdictions receiving federal emergency management funding. Within NIMS, the Incident Command System (ICS) provides the specific organizational structure for field operations: unified command, section chiefs, division and group supervisors, and the branch structure that allows multi-agency field operations to function under a single command framework. Exercise design for multi-agency drills should reflect the ICS structure that participating agencies are expected to operate within during a real incident. For planning resources and current NIMS documentation, FEMA maintains a comprehensive resource library at fema.gov/emergency-managers/incident-management/incident-command-system-resources.

Smoke deployment in a multi-agency exercise should map to the ICS organizational structure. Division supervisors responsible for field sectors where smoke simulation will be active need to understand the devices in use, the planned density and duration, and the safety protocols applicable to their division. Briefing smoke deployment through the ICS briefing structure, rather than as a separate logistics item handled outside the command framework, ensures that smoke becomes a realistic exercise variable that the unified command structure must manage, rather than a production element that exercises participants are aware of and discount as artificial.

HSEEP: Exercise Design and Evaluation Standards

The Homeland Security Exercise and Evaluation Program (HSEEP) provides a standardized methodology for designing, conducting, and evaluating emergency management exercises at all levels of government. HSEEP-compliant exercise planning follows a specific design cycle: identify capabilities to test, develop exercise objectives tied to those capabilities, design scenarios that stress those capabilities, conduct the exercise, and produce an After Action Report and Improvement Plan. For multi-agency exercises receiving federal preparedness grant funding, HSEEP compliance is a documentation and reporting requirement. Current HSEEP guidance, templates, and the After Action Report format are maintained by FEMA at fema.gov/emergency-managers/national-preparedness/exercises/hseep.

Smoke simulation in a HSEEP-compliant exercise should be tied to specific exercise objectives. If an exercise objective is to evaluate the ability of unified command to manage resource requests from field divisions operating in degraded-visibility conditions, the smoke deployment protocol and the evaluation criteria for that objective should be documented in the exercise plan before the event. Evaluators positioned with field divisions during the exercise can use the smoke environment to assess whether field supervisors communicate visibility status to the command post, whether the command post incorporates that information into resource decisions, and whether ICS briefing materials are updated to reflect changing field conditions. Smoke that is deployed without a corresponding documented exercise objective contributes atmosphere but does not generate measurable evaluation data.

Inter-Agency Approval and Procurement Coordination

Multi-agency exercises involve participants from organizations with different procurement policies, safety officer authorities, and device approval processes. A smoke device approved for use by the lead fire department may not be on the approved device list for a participating law enforcement agency or EMS service. Exercise planners should initiate the inter-agency device approval process at least 60 days before the exercise date, distributing Safety Data Sheets and burn specification documentation to safety officers at each participating agency and obtaining written confirmation of device approval from each before finalizing the smoke deployment plan.

For exercises involving federal agency participation (FEMA, DHS, National Guard, or federal law enforcement), device documentation requirements may be more extensive. Obtain lot-specific SDS documentation and confirm that devices carry a documented surface temperature below 200 degrees Fahrenheit throughout the burn cycle. Federal agency safety officers frequently require documentation of testing methodologies and third-party testing records in addition to standard SDS sheets. Plan for a 90-day documentation lead time when federal agencies are participating.

Device Selection for Multi-Agency Exercise Environments

Cold-Burn, Non-Toxic Formulations: The Only Acceptable Category

Multi-agency exercises may involve personnel from agencies without regular smoke device training experience. Law enforcement officers, public works supervisors, and emergency management staff embedded in field roles may not have the device-handling experience that fire service personnel develop through regular drill use. Device selection for multi-agency exercises should reflect the full range of personnel who will be in proximity to operating devices, not just the most experienced participants.

Cold-burn devices with surface temperatures below 200 degrees Fahrenheit throughout the burn cycle are the only appropriate choice for multi-agency exercise environments. Devices with high surface temperatures that are acceptable in fire service training contexts, where participants are wearing full gear and have specific device-handling training, introduce unacceptable injury risk in mixed-participation environments where some field personnel are in normal duty uniforms without gear. Non-toxic formulations with SDS documentation confirming the absence of hexachloroethane, sulfur compounds, and heavy metal colorants are required for scenarios where EMS personnel may be operating in the same zones as deployed devices.

The Shutter Bombs EG25 and the broader institutional device line provide the surface temperature documentation and clean SDS records that support inter-agency approval across the full range of participating organizations. For multi-agency exercises, B2B procurement through shutterbombs.com provides lot-level documentation appropriate for inclusion in exercise planning records and HSEEP documentation files.

Color Selection for Multi-Agency Communication

Smoke color in a multi-agency exercise can serve a functional communication role if exercise planners build color assignments into the scenario design. Assigning distinct smoke colors to different hazard zones or sectors allows command post personnel to visually identify zone boundaries and assess the exercise scenario state during the event. A common convention:

• White smoke: Primary structure smoke source, the baseline incident environment. Used to fill the interior of a simulated structure or the primary incident zone.
• Orange smoke: Secondary hazard zone or contamination boundary marker. Visible at distance and easily distinguished from white interior smoke.
• Purple or violet smoke: Mass casualty collection point markers or patient extraction corridors. Highly visible from aerial vantage points for exercises involving helicopter assets or drone observers.
• Red smoke: Active hazard boundary or danger zone perimeter. Used to mark areas that field personnel should not enter without full protective equipment.

Color assignments should be documented in the exercise plan and briefed to all participating agencies before the exercise. Evaluators and controllers who are not embedded with specific field teams need to know the color convention to correctly interpret field conditions from observation positions. Inconsistent use of smoke colors, or color assignments that are not communicated to all participants before exercise start, produce confusion rather than enhanced communication in the exercise environment.

Deployment Protocols for Multi-Agency Scenario Types

Mass Casualty Incident Exercises

Mass casualty incident (MCI) exercises test the coordination between fire departments, EMS services, law enforcement, and hospitals across the patient-flow pipeline from incident site to treatment facilities. The fire service component typically involves search and rescue operations in a simulated structure, extraction of patients through a hot-zone perimeter, and handoff to EMS for triage and transport. Law enforcement establishes the incident perimeter and manages access control. Smoke simulation in an MCI exercise should be concentrated in the primary structure zone where fire department search and extraction teams will be operating, with clear-zone staging at the treatment collection points where EMS personnel are working.

Protocol for MCI smoke deployment:

1. Structure interior zone (fire department operations): Deploy cold-burn devices inside the simulated structure at 70 to 80 percent visibility-reduction density. This is the zone where fire service personnel with full gear and SCBA will be operating. Smoke conditions should reflect the conditions that would prompt hazmat or confined space entry protocols, requiring full gear rather than nominal protective equipment.
2. Hot-zone perimeter transition (extraction corridor): Stage devices along the extraction corridor between the structure exit and the decontamination or warm-zone transition point. This zone simulates residual contamination that extraction teams and EMS receiving personnel need to account for. Reduced density of 30 to 40 percent is appropriate for this transition zone, as extraction teams are moving patients who cannot tolerate full-density conditions.
3. Treatment collection point (clear zone): No smoke deployment in the treatment collection point or cold zone where EMS patient triage and treatment will occur. Clear-zone conditions allow EMS personnel to function at full capacity without the protective equipment restrictions that smoke conditions impose, which is realistic for the treatment zone function they will perform during an actual MCI.

Unified Command Structure Exercises

Exercises designed to test the unified command structure, rather than the field operations themselves, focus on command post function: information flow from field divisions to section chiefs, resource request processing, situation status updates, and inter-agency communication protocols. Smoke is less central to unified command exercises than to field operations exercises, but it remains a valuable tool for testing whether command post personnel receive and accurately process field status reports that include smoke conditions as a variable.

For unified command exercises, deploy smoke in one or two field divisions and require field division supervisors to communicate smoke status, density changes, and device replacement needs to the command post through normal ICS radio protocols. Evaluators embedded at the command post assess whether the operations section chief incorporates real-time field smoke conditions into resource assignments, whether situation status boards are updated to reflect smoke conditions, and whether the public information officer and liaison officer receive accurate field condition information for their respective functions. This approach tests command post communication quality without requiring command post personnel to be in direct contact with smoke environments.

Active Threat or Law Enforcement Integration Exercises

Exercises that include law enforcement tactical components, such as active threat scenarios or hostage rescue simulations, require careful smoke deployment coordination with the law enforcement agency's tactical unit. Law enforcement tactical units have specific operational and safety standards that differ from fire service standards, and smoke deployment in zones where law enforcement personnel will be operating requires advance coordination with the agency's tactical supervisor and safety officer.

In active threat scenarios, smoke is most effectively deployed to simulate the environmental conditions that would affect fire department and EMS operations in the outer perimeter, rather than in the inner perimeter where law enforcement tactical personnel are operating. If the exercise design requires smoke in the tactical environment, the law enforcement tactical unit's safety officer must approve the specific devices and deployment protocol before exercise execution. Cold-burn, non-toxic devices are required in this context, and deployment should be handled only by designated fire service personnel rather than by law enforcement participants.

Documentation Requirements for Multi-Agency Exercises

Multi-agency exercises produce documentation that is reviewed by multiple agencies and, for federally funded exercises, by federal evaluators. Smoke device documentation should be included in the formal exercise planning file rather than treated as a logistics detail managed separately from the main exercise documentation package.

Minimum documentation for each smoke device type used in the exercise:

• Current Safety Data Sheet for each device type, with the document date confirmed within 12 months of the exercise date.
• Surface temperature specification and documentation of the test methodology used to establish that specification.
• Written inter-agency approval records from the safety officer of each participating agency, confirming approval for the specific device types used.
• Device deployment map showing the planned location and activation sequence of each device in the exercise scenario.
• Device safety briefing record confirming that all exercise personnel were briefed on device characteristics and safety protocols before exercise start.
• Lot numbers for all devices procured, to support any post-exercise incident review if a participant reports an adverse exposure.

This documentation package supports HSEEP After Action Report requirements and provides the inter-agency documentation baseline that each participating agency may need for its own safety records.

Integration with the Broader Firefighter Training Program

Multi-agency exercises represent the highest complexity level in a regional emergency management training program. They build most effectively when participating personnel have prior exposure to smoke simulation in single-agency drills specific to their operational role. Fire department personnel who have completed fire officer incident command training under smoke conditions are better equipped to maintain command communication quality during a multi-agency exercise than personnel whose only smoke simulation experience is through the joint exercise. EMS personnel who have trained in smoke-adjacent environments, and law enforcement personnel who have participated in degraded-visibility scenario training within their own agency, all perform more reliably in the joint exercise environment than personnel encountering realistic smoke conditions for the first time in a multi-agency context.

For fire department training coordinators who are building toward multi-agency exercise participation, the hazmat response smoke training guide covers joint operations protocols applicable to the hazmat scenarios common in multi-agency exercises. The mass casualty incident smoke training guide covers fire department operations in the structure zone during MCI exercises, which is the most commonly smoke-intensive component of joint exercises. The firefighter training smoke guide provides the foundational framework for building the single-agency smoke simulation program that should precede multi-agency exercise participation. For a full view of the firefighter training smoke resource library, see the Firefighter Training Smoke hub.